How Do Connection and Ambient Transactions Differ in .NET 2.0?

.NET 2.0 Transaction Processing: A Comprehensive Guide

Transaction processing is critical in database operations, ensuring that changes to data are either completed successfully or completely rolled back to maintain data integrity. In C# .NET 2.0, there are two main types of transactions: connection transactions and environment transactions.

Connection Transaction

Connection transactions are represented by the SqlTransaction class and are directly bound to the database connection. They have the advantage of explicitly controlling the connection, allowing you to pass it around as needed. An example of using a connection transaction is as follows:

using (IDbTransaction tran = conn.BeginTransaction())
{
    try
    {
        // 数据库操作
        tran.Commit();
    }
    catch
    {
        tran.Rollback();
        throw;
    }
}

However, when working across multiple methods or databases, connection transactions can become unwieldy because you need to pass the connection explicitly.

Environmental Affairs

Ambient transactions (represented by the TransactionScope class) were introduced in .NET 2.0 and provide a more convenient approach. They allow you to define a scope within which all operations are automatically registered in a transaction. This makes it particularly suitable for retrofitting existing non-transactional code. Example of using environmental transactions:

using (TransactionScope tran = new TransactionScope())
{
    CallAMethodThatDoesSomeWork();
    CallAMethodThatDoesSomeMoreWork();
    tran.Complete();
}

In this example, both methods handle their own connections independently, while automatically participating in the environment without passing any parameters.

Advantages of TransactionScope

Compared with connection transactions, TransactionScope provides the following advantages:

• Automatically register resources without explicit passing
• Can participate in transactions across multiple data sources and providers
• Simplify transaction processing in existing code

Notes

While TransactionScope offers significant advantages, there are some caveats:

• In SQL Server 2000, TransactionScope always uses the Distributed Transaction Coordinator (DTC), which can add overhead. This issue is resolved in SQL Server 2005 and later versions.
• The glitch may require you to adjust the connection string for proper TransactionScope functionality.

Conclusion

In C# .NET 2.0, connection transactions and environment transactions each have their own uses. Connection transactions provide explicit control but can become cumbersome in some situations. Environmental transactions, on the other hand, provide a convenient and flexible solution for managing transactions across multiple resources. By understanding the pros and cons of each approach, you can effectively implement transactions to ensure data integrity and reliability in your applications.

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